public void Add(Connection conn)
{
connections.Add(conn);
diagram.Control.Children.Add(conn.Control);
conn.Control.ContainerCanvas = diagram.Control;
conn.Owner = diagram;
Canvas.SetZIndex(conn.Control, Count);
}
public void Remove(Connection conn)
{
conn.Sink = null;
conn.Source = null;
conn.Owner = null;
conn.Control.ContainerCanvas = null;
connections.Remove(conn);
diagram.Control.Children.Remove(conn.Control);
}